Urban wastewater treatment by electrocoagulation and flotation

1995 ◽  
Vol 31 (3-4) ◽  
pp. 275-283 ◽  
Author(s):  
M.-F. Pouet ◽  
A. Grasmick
Keyword(s):  
Waste Water ◽  
Chemical Process ◽  
Waste Water Treatment ◽  
Pollution Abatement ◽  
Dissolved Air Flotation ◽  
Physico Chemical ◽  
Pollution Removal ◽  
Urban Wastewater Treatment ◽  
Dissolved Air

In waste water treatment, the use of a physico-chemical process by flotation would present some advantages compared to a separation by settling. However like each physico-chemical process, a separation by flotation needs a chemical destabilization. We have studied the use of an electrochemical destabilization coupled to a process of flotation (DAF). This paper presents the results obtained on an urban waste water treated by electrocoagulation and dissolved air flotation (DAF). To show the interest of coupling flotation and electrocoagulation, we have studied each process separately. Then we have combined the two processes. The role of each operation on pollution removal is presented. An effect of synergism between the two processes on the pollution abatement is shown. A reduction of 75% of the global COD is obtained. The results of the coupling are compared to the performance of an intensive treatment by flocculation-lamellar settler.

scholarly journals EFFICIENCY RESEARCH ON MEAT INDUSTRY WASTE WATER TREATMENT APPLYING THE METHOD OF DISSOLVED AIR FLOTATION / MĖSOS PRAMONĖS NUOTEKŲ VALYMO FLOTACINIU METODU EFEKTYVUMO TYRIMAS

2012 ◽  
Vol 3 (6) ◽  
pp. 5-7
Author(s):  
Valentinas Gerasimovas ◽  
Robertas Urbanavičius
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Industrial Pollution ◽  
Waste Water Treatment ◽  
Meat Industry ◽  
Saturated Liquid ◽  
Dissolved Air Flotation ◽  
Optimal Ratio ◽  
Industry Waste ◽  
Dissolved Air

To protect environment from industrial pollution, strict requirements for waste water treatment are imposed. The purpose of research is to establish an optimal ratio of saturated liquid and meat industry waste water. Research included JCC “Traidenis” waste water treatment system installed in JSC “BHJ Baltic”. Investigations into treated waste water indicated that an optimal ratio of waste water and saturated liquid was 2/1 under duration time of 8 minutes. Efficient waste water treatment made 86% and the ratio of waste water and saturated liquid was 2/1. Santrauka Siekiant apsaugoti gamtą nuo pramoninės taršos, nuotekų valymui keliami vis didesni reikalavimai. Darbo tikslas – nustatyti optimalų skysčio ir oro emulsijos ir mėsos pramonės nuotekų santykį. Nuo skysčio ir oro emulsijos ir nuotekų santykio priklauso nuotekų valymo įrenginių kaina ir eksploatacijos išlaidos. Jei bus pasirinktas netinkamas santykis, nuotekų valymo įrenginiams reikės daugiau priežiūros, o tam prireiks papildomų išlaidų. Tyrimams atlikti pasirinkta UAB „Traidenis“ flotacinė nuotekų valymo sistema, sumontuota UAB „BHJ Baltic“ antrinių žaliavų perdirbimo įmonėje. Atlikus tyrimus nustatyta, kad optimalus skysčio ir oro emulsijos ir nuotekų santykis buvo 2:1. Esant tokioms sąlygoms, pasiektas 86 % valymo efektyvumas.

Role of nanomaterial's as adsorbent for heterogeneous reaction in waste water treatment

2021 ◽  
pp. 130596
Author(s):  
M. Sridevi ◽  
C. Nirmala ◽  
N. Jawahar ◽  
G. Arthi ◽  
Sugumari Vallinayagam ◽  
...  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Heterogeneous Reaction ◽  
Waste Water Treatment

scholarly journals Bioremoval of chromium from wastewater of tannery factory in Iraq

2008 ◽  
Vol 5 (3) ◽  
pp. 399-405
Author(s):  
Baghdad Science Journal
Keyword(s):  
Waste Water ◽  
Contact Time ◽  
Chemical Process ◽  
Physiological State ◽  
Living Cells ◽  
Electrostatic Attraction ◽  
Optimum Conditions ◽  
Proteus Vulgaris ◽  
Insignificant Effect ◽  
Physico Chemical

Bioremoval of chromium from wastewater of tannery factory in Iraq was studied. The bacteria Proteus vulgaris 7E showed an enhanced capability in biosorping chromium when its concentration increased in the solution, reaching a maximum of 476,7 mg/ ml out of 492 mg/ ml under optimum conditions at pH 6 and 50°C at one hour contact time and biomass of 1 mg/ml. The present results showed that dead cells of P. vulgaris 7E biosorbed 87.41 mg/ml of chromium in comparison with91.18 mg/ml of chromium biosorbed by living cells, this indicates the insignificant effect of physiological state of cells. It was found that the above biosorption is physico-chemical process depends upon electrostatic attraction forces. The results has illustrated that the most efficient eluting solution was 0.1M HCL which recovered 85% of biosorbed chromium. P. vulgaris 7E was able to remove completely all chromium from the waste water taken from tannery factory.

scholarly journals ENZYMATIC WASTE WATER TREATMENT

World Science ◽  
2021 ◽  
Author(s):  
Nancey Hafez
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Water Treatment ◽  
Metal Ions ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
High Energy ◽  
Enzymatic Reactions ◽  
Biological Interactions ◽  
Physico Chemical

Enzymes are biocatalysts provided by cells and are used in most metabolic methods. Most enzymes are consisting of proteins containing tertiary amino acid which bind to co enzyme or metal ions. Enzymes are accelerating biochemical processes by some mechanisms to chemical catalysts e.g metals, metal oxides and metal ions. Enzymes can be very effective under conditions e.g (temperature, atmospheric pressure and PH). Many enzymes have hydrolyzing, oxidizing and reducing characters. Enzymatic reactions always provide less side effects reactions and fewer waste by products. That is why microbial Enzymes can give an effective and environmental safe alternatives as metabolic inorganic chemical catalysts which can be used in all over pharmaceutical industrial processes. Enzymes are used in waste water treatment. Treatment technologies depend on physico-chemical approaches in wastewater treatment plants which require skills, high operation costs (in terms of high energy and chemical demand). Wastewater treatment is operated to protect the quality of limited freshwater resources, which are most times the final discharge points of effluents, and also, to promote the reusability of expended clean water; amounts of hazardous aromatic byproducts are still generated [3, 4]. The observation shows that wastewater treatment plants, though liable to remove microcontaminants such as heavy metals, and to a far lesser extent, aromatic contaminants, were originally structured for the removal of solid wastes, ecofriendly organic matter and eutrophication stimulants from wastewater, thereby reducing eutrophicating pollution loads; the micropollutants may only be moderately affected by the chemical, physical and biological interactions within the treatment plants.

TERTIARY TREATMENT OF URBAN WASTEWATER BY CROSS FLOW MICROFILTRATION

1994 ◽  
Vol 30 (4) ◽  
pp. 133-139 ◽  
Author(s):  
M.-F. Pouet ◽  
A. Grasmick ◽  
F. Homer ◽  
F. Nauleau ◽  
J. C. Cornier
Keyword(s):  
Chemical Process ◽  
Cross Flow ◽  
Operating Conditions ◽  
Activated Sludge Process ◽  
Tertiary Treatment ◽  
Urban Wastewater ◽  
Physico Chemical ◽  
Upstream Process

Using cross flow microfiltration as a tertiary treatment would make the treatment reliable and achieve virtually a total disinfection. However, the use of the membrane techniques is IimiIed because of the material fouling. Our results show that the fouling mechanisms depend on the choice of the secondary upstream process. The quality of the effluent and the permeaIe flux obtained are very different if the sewage has been treated by a biological or by a physico-chemical process. The operating conditions of these processes have also an influence on the variations of the membrane permeability. In particular we have observed the importance of the load in the case of an activated sludge process and the role of the coagulant dose in the case of a physico-chemical process. The supracolloidal fraction of the suspensions seems to be one of the main fouling reasons.

Application of dissolved air flotation for treatment of wastewater from meat processing industry

1995 ◽  
Vol 31 (3-4) ◽  
pp. 341-344 ◽  
Author(s):  
J. Wasowski
Keyword(s):  
Rational Design ◽  
Meat Processing ◽  
Waste Waters ◽  
Processing Industry ◽  
Dissolved Air Flotation ◽  
Technological Factors ◽  
Air Flotation ◽  
The Given ◽  
Dissolved Air

The paper concerns the application of dissolved air flotation for treatment of waste water from the meat processing industry. The main aim of the study was identification of the flotation mechanism aided by the coagulation in the layouts with and without recycling, and finding and defining the role of the technological factors influencing flotability of pollutants found in the given waste waters. The results of the studies, supported by the mathematical analysis, form the basis of rational design and conduction of flotation in practice.

Flotation of algae for water reuse and biomass production: role of zeta potential and surfactant to separate algal particles

2015 ◽  
Vol 72 (5) ◽  
pp. 762-769 ◽  
Author(s):  
Dong-Heui Kwak ◽  
Mi-Sug Kim
Keyword(s):  
Zeta Potential ◽  
Anionic Surfactant ◽  
Water Reuse ◽  
Separation Efficiency ◽  
Microalgae Cultivation ◽  
Separation Processes ◽  
Dissolved Air Flotation ◽  
Chemical Coagulation ◽  
Dissolved Air

The effect of chemical coagulation and biological auto-flocculation relative to zeta potential was examined to compare flotation and sedimentation separation processes for algae harvesting. Experiments revealed that microalgae separation is related to auto-flocculation of Anabaena spp. and requires chemical coagulation for the whole period of microalgae cultivation. In addition, microalgae separation characteristics which are associated with surfactants demonstrated optimal microalgae cultivation time and separation efficiency of dissolved CO2 flotation (DCF) as an alternative to dissolved air flotation (DAF). Microalgae were significantly separated in response to anionic surfactant rather than cationic surfactant as a function of bubble size and zeta potential. DAF and DCF both showed slightly efficient flotation; however, application of anionic surfactant was required when using DCF.

Role of Nanocatalyst (photocatalysts) for waste water treatment

2020 ◽  
Vol 16 ◽  
Author(s):  
Muhammad Sagir ◽  
Muhammad Bilal Tahir
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Nano Materials ◽  
Nano Technology ◽  
Treatment Processes ◽  
Photo Catalysis ◽  
Carbon Nano Tubes ◽  
Large Research

Background: The aim of current study is to understand the application of Nano-technology in the field of water and waste water treatment processes due to increasing scarcity of water as time goes on.The knowledge about the effect of various photo catalysts on the treatment of waste water is also compiled here. Introduction: In recent years, many researches have been working on the projects for the removal of organic & inorganic pollutants from water using photo catalysts which provide more efficient, economical and as well as pollution free processes to some extent. Nanomaterials are found in large research categories and are used in variety of applications. Method: Photo catalysis using Iron, Zinc, Silver, Metal oxides, SnO2, Carbon Nano-tubes, Nano composites & Membranes are focused in this paper. Result: Discussion regarding various parameters as well as future aspects of nanoparticles on waste water treatment are highlighted. Impacts of nanoparticles on health is also incorporated here. Conclusion: Considering the current speed of development and revolution in tech, Nano materials for this type of applications seems very promising.

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